Tags

Type your tag names separated by a space and hit enter

Rate constants for the reaction of hydroxyl and sulfate radicals with organophosphorus esters (OPEs) determined by competition method.
Ecotoxicol Environ Saf. 2019 Apr 15; 170:300-305.EE

Abstract

Advanced oxidation processes (AOPs), such as hydroxyl radical (•OH) and sulfate radical (•SO4-) mediated oxidation, are proved to be effective methods to remove the organophosphorus esters (OPEs) in wastewater effluents. However, few studies have reported about the bimolecular reaction rate constants between free radicals (•OH and •SO4-) and OPEs. This issue was solved by selecting three OPEs as model compounds, the oxidation of these OPEs in UV/H2O2 and UV/K2S2O8 process were studied. Tris(2-chloroethyl) phosphate (TCEP), tris(1-chloro-2-propyl) phosphate (TCPP), and tris(2,3-dichloropropyl) phosphate (TDCPP) can hardly be oxidized through direct irradiation methods using UV lamp, with the oxidation rate less than 30% after 7 h' irradiation. However, TCEP, TCPP, and TDCPP undergo degradation via UV/H2O2 and UV/K2S2O8 processes easily, the oxidation rates increased with increasing H2O2 and K2S2O8 dosage. The oxidation rates of three OPEs have been studied using competition experiments in the UV/H2O2 and UV/K2S2O8 processes. The bimolecular reaction rate constants of TCEP, TCPP and TDCPP with •OH were 2.50 × 1010, 3.95 × 1010 and 2.94 × 1010 respectively; while •SO4- were 3.00 × 107, 1.82 × 107 and 2.06 × 107 respectively. Results showed that the simplified kinetic model involves only steady state concentration of free radicals and the molecular reaction rate contents are available for calculating the oxidation rates of OPEs in ultrapure water.

Authors+Show Affiliations

School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China. Electronic address: gnlu@foxmail.com.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.College of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.College of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30530182

Citation

Tang, Ting, et al. "Rate Constants for the Reaction of Hydroxyl and Sulfate Radicals With Organophosphorus Esters (OPEs) Determined By Competition Method." Ecotoxicology and Environmental Safety, vol. 170, 2019, pp. 300-305.
Tang T, Lu G, Wang R, et al. Rate constants for the reaction of hydroxyl and sulfate radicals with organophosphorus esters (OPEs) determined by competition method. Ecotoxicol Environ Saf. 2019;170:300-305.
Tang, T., Lu, G., Wang, R., Qiu, Z., Huang, K., Lian, W., Tao, X., Dang, Z., & Yin, H. (2019). Rate constants for the reaction of hydroxyl and sulfate radicals with organophosphorus esters (OPEs) determined by competition method. Ecotoxicology and Environmental Safety, 170, 300-305. https://doi.org/10.1016/j.ecoenv.2018.11.142
Tang T, et al. Rate Constants for the Reaction of Hydroxyl and Sulfate Radicals With Organophosphorus Esters (OPEs) Determined By Competition Method. Ecotoxicol Environ Saf. 2019 Apr 15;170:300-305. PubMed PMID: 30530182.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Rate constants for the reaction of hydroxyl and sulfate radicals with organophosphorus esters (OPEs) determined by competition method. AU - Tang,Ting, AU - Lu,Guining, AU - Wang,Rui, AU - Qiu,Zhiyuan, AU - Huang,Kaibo, AU - Lian,Wenjie, AU - Tao,Xueqin, AU - Dang,Zhi, AU - Yin,Hua, Y1 - 2018/12/07/ PY - 2018/10/21/received PY - 2018/11/29/revised PY - 2018/11/30/accepted PY - 2018/12/12/pubmed PY - 2019/2/14/medline PY - 2018/12/12/entrez KW - Advanced oxidation process KW - Bimolecular reaction rate constants KW - Organic phosphate esters KW - Probe compound KW - Simplified kinetic model SP - 300 EP - 305 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 170 N2 - Advanced oxidation processes (AOPs), such as hydroxyl radical (•OH) and sulfate radical (•SO4-) mediated oxidation, are proved to be effective methods to remove the organophosphorus esters (OPEs) in wastewater effluents. However, few studies have reported about the bimolecular reaction rate constants between free radicals (•OH and •SO4-) and OPEs. This issue was solved by selecting three OPEs as model compounds, the oxidation of these OPEs in UV/H2O2 and UV/K2S2O8 process were studied. Tris(2-chloroethyl) phosphate (TCEP), tris(1-chloro-2-propyl) phosphate (TCPP), and tris(2,3-dichloropropyl) phosphate (TDCPP) can hardly be oxidized through direct irradiation methods using UV lamp, with the oxidation rate less than 30% after 7 h' irradiation. However, TCEP, TCPP, and TDCPP undergo degradation via UV/H2O2 and UV/K2S2O8 processes easily, the oxidation rates increased with increasing H2O2 and K2S2O8 dosage. The oxidation rates of three OPEs have been studied using competition experiments in the UV/H2O2 and UV/K2S2O8 processes. The bimolecular reaction rate constants of TCEP, TCPP and TDCPP with •OH were 2.50 × 1010, 3.95 × 1010 and 2.94 × 1010 respectively; while •SO4- were 3.00 × 107, 1.82 × 107 and 2.06 × 107 respectively. Results showed that the simplified kinetic model involves only steady state concentration of free radicals and the molecular reaction rate contents are available for calculating the oxidation rates of OPEs in ultrapure water. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/30530182/Rate_constants_for_the_reaction_of_hydroxyl_and_sulfate_radicals_with_organophosphorus_esters__OPEs__determined_by_competition_method_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0147-6513(18)31286-7 DB - PRIME DP - Unbound Medicine ER -